Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1998-03-04
1999-08-03
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
B22F 300
Patent
active
059328193
ABSTRACT:
The invention relates to a deflection ring of sintered MgZn-ferrite material. In accordance with the invention, this deflection ring is characterized in that the majority of the grains of the sintered material have a monodomain structure. By virtue thereof, a relatively small heat dissipation occurs in the ring when it is used in a cathode ray tube. The average grain size of the sintered MgZn-ferrite material is preferably 2.8 micrometers or less. MgZn-ferrite materials whose composition corresponds to the formula Mg.sub.1-z Zn.sub.z Fe.sub.2-y O.sub.4, wherein 0.1<z<0.4 and 0.01<y<0.3, have the additional advantage that they have a relatively high saturation magnetization and a relatively high electrical resistance. The invention also relates to a cathode ray tube comprising the above-mentioned deflection ring and to a mo1lding made from the above-mentioned MgZn-ferrite material.
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patent: 5057738 (1991-10-01), Boerekamp
S.H. Patil, et al, "Effect of Sintering on the magnetization behaviour of MgxZn(1-x)Fe204 system" Bull. Mater. Sci., vol. 14, No. 5, Oct. 1991, pp. 1225-1230.
De Wit Hendrik J.
Van Der Valk Pieter J.
Van Der Zaag Pieter J.
Bartlett Ernestine C.
Mai Ngoclan
U.S. Philips Corporation
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